Abstract

S. Radhakrishnan^1,2, K. Ramachandran³and K. Samuvel³

DOI : http://dx.doi.org/10.13005/ojc/320440

The dielectric relaxation of benzyl alcohol substitutents (benzyl alcohol, m-methylbenzyl alcohol and m-nitrobenzyl alcohol) with methyl methacrylate and butyl methacrylate in dilute solution of carbon tetrachloride is measured at 9.37 GHz using Frequency domain (X-band) technique. Different dielectric parameters like dielectric constant (ε׳), dielectric loss factor (ε״) at Microwave frequency, static dielectric constant (ε₀) and dielectric constant at infinite dilution (ε_∞) at optical frequency have been determined. From the measured dielectric data, the relaxation time (t) calculated using Higasi method and activation energies (∆F_t and ∆F_η) have been determined. All the dielectric parameters that are vary with the substitutent change in benzyl alcohol andchain length of acrylic esters. Suggests that, the proton donating ability is varying with the substitution of benzyl alcohol and proton accepting ability is varying with the chain length of acrylic esters. The relaxation time and molar free energy activation of 1:1 molar ratio is greater than other higher molar ratios (i.e. 3:1, 2:1, 1:2, 1:3) confirm that the existence of most likely 1:1 complex formation between the studied systems and also complex formation formed between free hydroxyl group of substituted benzyl alcohols and carbonyl group of acrylic esters (MMA and EMA).

Relaxation time; Activation free energy; Benzyl alcohol; Methyl methacrylate; Butyl methacrylate

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